Toward multi-object nonprehensile transportation via shared teleoperation: A framework based on virtual object model predictive control
Xinyang Fan , Zhaoyang Chen , Shu Xin , Yi Ren , Zainan Jiang , Fenglei Ni , Hong Liu
ENG. Mech. Eng. ›› 2026, Vol. 21 ›› Issue (3) : 100888
Multi-object nonprehensile transportation in teleoperated robotic systems poses a dual control challenge: real-time trajectory tracking and simultaneous tray orientation control to satisfy object dynamic constraints. Existing approaches face limitations, including difficulty satisfying trajectory state constraints, excessive model dependency, inadequate adaptability to multi-object scenarios, and a lack of robust mechanisms for handling uncertain object parameters. To address these limitations, this work proposes a novel shared teleoperation framework for multi-object nonprehensile transportation, which enables shared control between human operators and the robotic system for object positioning; meanwhile, the robot autonomously controls object orientation to satisfy task constraints. The primary contributions are threefold: First, a theoretical analysis of dynamic constraints is developed, incorporating object position, inertial parameters, quantity, friction coefficients, and motion states. Furthermore, a virtual object-based dynamic constraint processing method is proposed for the first time, enabling simplified dynamic constraints to be directly utilized for trajectory planning. Second, a model predictive control-based trajectory smoothing algorithm with real-time dynamic constraint enforcement is designed, enabling dynamic coordination between user input tracking and orientation control. Third, simulation and experimental validation confirm that the proposed method successfully ensures dynamic constraints for all objects and achieves stable manipulation of nine different objects at accelerations up to m/s2. Compared with the baseline method, the approach achieves a % reduction in sliding distance and maintains a zero tip-over rate (compared with % for the baseline). These results demonstrate enhanced adaptability to multi-object parameters and robust performance in complex nonprehensile transportation scenarios.
virtual object / model predictive control / multi-object nonprehensile transportation / shared teleoperation / dynamic constraint processing / trajectory smoothing
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Higher Education Press
Supplementary files
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